Blitting ddraw surface to window

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mindcooler

Joined: 01 Dec 2009
Posts: 423
Location: Västerås, Sweden

mindcooler 06 Nov 2011, 10:56

I have some trouble blitting my IDIRECTDRAWSURFACE7 onto my window. I opted for the gdi method, which seemed to work nicely in the beginning:

Code:

.WM_PAINT:
          mov     esi,ps
              invoke  BeginPaint,[hwindow],esi

                xor     ebx,ebx
             cominvk secondary,GetDC,dc
          invoke  BitBlt,dword [esi],ebx,ebx,WINDOWX,WINDOWY,dword [dc],ebx,ebx,SRCCOPY
               cominvk secondary,ReleaseDC,dword [dc]

          invoke  EndPaint,[hwindow],edi
              jmp     .out

Problem is that something is leaking memory, and after some 45 seconds of drawing, the blit starts complaining with ERROR_NOACCESS. It is as if the DC:s don't get released even though I ReleaseDC. Any idea why? Should I use another method for drawing?

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06 Nov 2011, 10:56

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20450
Location: In your JS exploiting you and your system

revolution 06 Nov 2011, 11:01

Code:

                invoke  BeginPaint,[hwindow],esi
;...
                invoke  EndPaint,[hwindow],edi

Where do you define EDI?

06 Nov 2011, 11:01

mindcooler

Joined: 01 Dec 2009
Posts: 423
Location: Västerås, Sweden

mindcooler 06 Nov 2011, 11:04

revolution wrote:

Where do you define EDI?

Nice catch! Never thought that it was the ps dc that I was wasting. Always nice with a fresh set of eyes! Smile

It seems to be working perfectly now, thanks.

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06 Nov 2011, 11:04

typedef

Joined: 25 Jul 2010
Posts: 2909
Location: 0x77760000

typedef 06 Nov 2011, 17:28

Have you rad the documentation clearly ?

It's

Code:

HDC hDc = BeginPaint(hWin, &ps);
BitBlt(hDc,

NOT

Code:

 HDC hDc = BeginPaint(hWin, &ps);
BitBlt(ps.hdc,

The second one will give you trouble

06 Nov 2011, 17:28

mindcooler

Joined: 01 Dec 2009
Posts: 423
Location: Västerås, Sweden

mindcooler 06 Nov 2011, 21:15

typedef wrote:

The second one will give you trouble

I don't see why as they are the same thing.

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06 Nov 2011, 21:15

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